185125145 has 4 divisors (see below), whose sum is σ = 222150180. Its totient is φ = 148100112.

The previous prime is 185125141. The next prime is 185125159. The reversal of 185125145 is 541521581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 541521581 = 11927 ⋅45403.

It can be written as a sum of positive squares in 2 ways, for example, as 57638464 + 127486681 = 7592^2 + 11291^2 .

It is a cyclic number.

It is not a de Polignac number, because 185125145 - 2² = 185125141 is a prime.

It is a super-2 number, since 2×185125145² = 68542638622542050, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (185125141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18512510 + ... + 18512519.

It is an arithmetic number, because the mean of its divisors is an integer number (55537545).

Almost surely, 2^185125145 is an apocalyptic number.

It is an amenable number.

185125145 is a deficient number, since it is larger than the sum of its proper divisors (37025035).

185125145 is an equidigital number, since it uses as much as digits as its factorization.

185125145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37025034.

The product of its digits is 8000, while the sum is 32.

The square root of 185125145 is about 13606.0701526929. The cubic root of 185125145 is about 569.9303752036.

The spelling of 185125145 in words is "one hundred eighty-five million, one hundred twenty-five thousand, one hundred forty-five".